A heat conversion and recovery system for decommissioned wind turbine blades

Abstract

This invention proposes a thermal conversion and recovery system for decommissioned wind turbine blades, belonging to the field of wind turbine blade recycling. The system includes a material grabber, an isolation conveyor, a sealed feeder, a pyrolysis furnace, an incinerator, a transition conveyor, a low-temperature oxidation furnace, and a cooling discharger. The material grabber is located at the left end of the isolation conveyor, grabbing and feeding decommissioned wind turbine blades cut to a certain size onto the conveyor chain of the isolation conveyor. Driven by a drive mechanism, the decommissioned blades sequentially pass through the isolation conveyor, the sealed feeder, the pyrolysis furnace, the transition conveyor, the low-temperature oxidation furnace, and the cooling discharger, undergoing pyrolysis and oxidation during this process to ultimately obtain fiber products. This invention avoids the high-temperature destruction of fiber components in the blades by using temperature-controlled pyrolysis and low-temperature oxidation. Simultaneously, the chain supports the conveying of large-sized materials, eliminating the material crushing process. The atmosphere inside the furnace is controlled by an isolation door to ensure safe operation of the equipment, achieving high-quality and stable recovery of wind turbine blade fibers.

Description

Technical Field

[0001] This invention belongs to the field of wind turbine blade recycling, specifically relating to a heat conversion and recovery system for retired wind turbine blades. Background Technology

[0002] With increasing emphasis on environmental protection, the development and utilization of renewable and clean energy have received widespread attention worldwide. Wind energy, as an important clean and renewable energy source, has seen rapid development in recent years, with installed wind power capacity increasing year by year. Wind turbine blades are crucial components of wind power generation. Generally, blades are designed for a 20-year lifespan, but currently, blades in operation have exceeded 15 years, generating tens of thousands of tons of decommissioned blades and waste annually. Furthermore, the number of decommissioned blades is expected to multiply within the next 5-8 years, necessitating the development of efficient methods for the disposal and utilization of wind turbine blades.

[0003] From a materials perspective, wind turbine blades are primarily composed of thermosetting resin composite materials reinforced with glass fiber or carbon fiber. They also contain elements such as foam, balsa wood core, adhesives, and coatings. Composite materials, as the main component of the blades, account for a significant portion of both usage and cost. Statistics show that composite materials currently account for over 90% of the total mass and over 50% of the total cost of existing wind turbine blades. Furthermore, thermosetting composite materials are chemically and physically stable and difficult to decompose in natural environments. Without proper disposal and utilization, this would result in substantial resource waste and environmental pollution.

[0004] Currently, the disposal and utilization of retired wind turbine blades in my country is still in its initial stage. Existing technologies mainly include physical dismantling and recycling, energy utilization, chemical degradation, and pyrolysis. Physical dismantling and recycling primarily involves dismantling, cutting, and assembling the blades to create other products, such as containers and decorative items. The blades can also be shredded and crushed into powder, which can then be added to other composite material products, such as cement mortar, gypsum board, and modified plastic products. This is a downgraded utilization method with limited processing capacity and is not considered the ultimate utilization path for blades. Energy utilization mainly involves adding the blades to an incinerator for combustion to obtain energy for power generation and heating. However, due to the high inorganic content in composite materials, incomplete combustion and excessive emissions are common. Chemical methods use chemical solvents and controlled reaction conditions to break specific chemical bonds in polymers, ultimately achieving the separation and recovery of resin and fiber. However, this method is currently immature, costly, and difficult to implement industrially. Pyrolysis is a method that involves heating wind turbine blades under anaerobic conditions, causing the organic polymer resin components to undergo thermal decomposition and polymerization, forming small- to medium-sized molecule liquid or gaseous products, and then recycling the fibers and fillers. Pyrolysis is a simple, technologically mature, and highly efficient method, making it one of the most likely methods for industrial application.

[0005] Chinese patent applications (202110574097.7, 202110255177.6, 202111549092.5, and 202110256548.2) have proposed devices and methods for processing wind turbine blades, including decomposition furnaces, fluidized beds, and continuous steel belt pyrolysis furnaces. While these devices have achieved good recovery of the organic components of wind turbine blades, they have certain shortcomings in recovering inorganic components such as fibers. Specifically, these pyrolysis devices require the wind turbine blades to be crushed beforehand to meet feed requirements, but the crushing process damages the fiber structure, reducing its quality and making it difficult to reuse in wind turbine blade manufacturing. Secondly, fiber recovery methods such as air classification or incineration have limitations. Air classification results in incomplete separation of pyrolysis char and fibers, while incineration involves excessively high temperatures that damage the fiber structure and reduce its quality. Therefore, there is an urgent need to develop devices that can efficiently separate and recover fibers without damaging their structure, thus achieving efficient recycling of wind turbine blades. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a heat conversion and recovery system for decommissioned wind turbine blades.

[0007] This system utilizes a specially designed feeding and discharging mechanism, pyrolysis furnace, oxidation furnace, and auxiliary equipment. The specially designed feeding and discharging equipment enables sealed feeding and discharging of large-sized blades, avoiding damage to the original wind turbine blade fibers during the crushing process. Through strict temperature control in the pyrolysis and oxidation processes, the fiber structure is protected from damage, achieving high-quality fiber recovery. The pyrolysis gas and residual carbon are directly combusted to generate heat, achieving self-heating operation, saving fuel, and utilizing energy in a cascade manner to achieve efficient energy recovery and reduce energy consumption, thereby realizing the efficient recycling and utilization of retired wind turbine blades.

[0008] To achieve the above objectives and technical effects, the present invention is implemented through the following technical solution:

[0009] A heat conversion and recovery system for decommissioned wind turbine blades includes: a material grabber, an isolation conveyor, a sealed feeder, a pyrolysis furnace, a sealed conveyor, a low-temperature oxidation furnace, and a cooling discharger, wherein:

[0010] The material handling machine is configured to pick up the cut, decommissioned wind turbine blades and place them on the conveyor chain plate of the isolation conveyor.

[0011] The isolation conveyor includes the conveyor chain plate, the isolation chamber, and isolation curtain doors and a first torque switch respectively disposed at both ends of the isolation chamber. The conveyor chain plate extends through the isolation curtain door to the outside of the isolation chamber so as to receive and convey the cut retired wind turbine blades through the isolation chamber. The first torque switch is configured to switch between open and closed states.

[0012] The sealed feeder is sealed to one end of the isolation conveyor equipped with the first torque switch and includes a feeding chain plate and a first isolation gate and a second isolation gate respectively arranged at both ends of the feeding chain plate and switchable between open and closed states. The feeding chain plate is configured to receive the decommissioned fan blades conveyed by the conveyor chain plate when the first isolation gate is open, and to output the decommissioned fan blades when the second isolation gate is open.

[0013] The pyrolysis furnace includes a furnace body with a second isolation gate at one end, which is sealed and connected to the sealed feeder at one end; a pyrolysis chain plate arranged inside the furnace body; a scraper chain plate arranged below the pyrolysis chain plate; and a radiant tube for heating the internal space of the furnace body. The pyrolysis chain plate is arranged to receive and transport the decommissioned fan blades output from the sealed feeder, so that the decommissioned fan blades are pyrolyzed under the radiation of the radiant tube. The furnace body is provided with a pyrolysis gas outlet and a residue outlet for discharging the pyrolysis gas and residue generated by the pyrolysis of the decommissioned fan blades, respectively. The scraper chain plate scrapes the residue and discharges it through the residue outlet.

[0014] The sealed conveyor is sealed to the other end of the pyrolysis furnace body and can transport the pyrolysis products of the decommissioned fan blades output from the pyrolysis furnace to the low-temperature oxidation furnace.

[0015] The low-temperature oxidation furnace includes an oxidation furnace body that is sealed at one end to the sealed conveyor and located away from the pyrolysis furnace, an oxidation chain plate arranged inside the oxidation furnace body, and a plurality of heating pipes arranged above the oxidation chain plate. The oxidation chain plate is arranged to receive and convey the pyrolysis products of the decommissioned fan blades conveyed by the sealed conveyor, and an air distribution box is arranged in the space surrounding the oxidation chain plate. The oxidation furnace body is provided with a feed inlet facing the feed end of the oxidation chain plate, a flue gas outlet for discharging flue gas, and a slag outlet for discharging residue.

[0016] The cooling discharge machine includes a discharge machine housing that is sealed at one end to the oxidation furnace body and is located away from the sealed conveyor, a cooling chain plate arranged in the discharge machine housing, and a brush roller arranged at the feed end of the cooling chain plate. The discharge machine housing is provided with a cooling air inlet, a gas outlet, and a buffer channel. A discharge valve is provided below the buffer channel.

[0017] In a preferred embodiment, the isolation conveyor includes a conveyor chain plate, an isolation curtain door, an isolation chamber, a first torque switch, and a flange connection port. The conveyor chain plate includes left and right parts, with the left part arranged outside the isolation chamber and the right part arranged inside the isolation chamber. The isolation curtain door is located at the left end of the isolation chamber, and the flange connection port is located at the right end of the isolation chamber. The first torque switch is located above the right end of the conveyor chain plate.

[0018] In a preferred embodiment, the sealed feeder includes a left flange interface, a first isolation gate, a first guide plate, a first support plate, a first torque switch wiring, a first controller, a first photoelectric switch, a feeding chain plate, a nitrogen purging port, a first drive motor, a second drive motor, a second controller, a second torque switch, a second isolation gate, a second photoelectric switch, a second guide plate, a reinforcing rib plate, a second support plate, and a right flange interface. The left flange interface is located at the left end of the sealed feeder and is connected to the flange connection port of the isolation conveyor. The first isolation gate is located adjacent to the right side of the left flange interface. The first isolation gate has a drive structure that allows free control of its opening and closing actions. Below the first isolation gate is the first guide plate. The left end of the first guide plate extends to the right end of the adjacent but not contacting conveyor chain plate, and its right end extends to the left end of the adjacent but not contacting feeding chain plate. A first support plate is located at the center of the lower surface of the first guide plate. A first photoelectric switch is located on the right side of the first isolation gate. The first photoelectric switch includes a transmitter and a receiver. The receiver is located at the center of the right side of the first guide plate, and the transmitter is positioned on the furnace top directly opposite it. The first controller is connected to the first isolation gate, the first photoelectric switch, and the first drive motor. The first controller also has wiring for a first torque switch, connected to the first torque switch, and controls the opening and closing of the first isolation gate through signals from the first torque switch and the first photoelectric switch. The feeding chain plate is located to the right of the first guide plate. The feeding chain plate is located at a lower position inside the sealed feeder; the left and right ends of the feeding chain plate include freely rotatable sprockets, and the sprockets are chain plates that can rotate around them; the nitrogen purging port is provided in the gap in the middle of the chain plate; the second torque switch is provided above the right end of the upper chain plate of the feeding chain plate; the right end chain plate of the feeding chain plate is also provided with a second guide plate adjacent to but not in contact with it; the second support plate is provided at the center below the second guide plate; the left and right sides of the second support plate are also provided with reinforcing ribs, which are obliquely connected to the lower surfaces of the left and right side plates of the second guide plate. The center of the upper surface of the second guide plate is directly opposite the second isolation gate. The second photoelectric switch is provided on the left side of the second isolation gate. The second photoelectric switch includes a transmitter and a receiver. The transmitter is arranged on the top of the furnace body, and the receiver is arranged on the second guide plate directly opposite it. The second controller is connected to the second torque switch, the second photoelectric switch, the second isolation gate, and the second drive motor respectively. The second controller controls the opening and closing of the second isolation gate through the signals of the second torque switch and the second photoelectric switch. The right end of the sealed feeder is also provided with a right flange interface.

[0019] In a preferred embodiment, the right flange interface of the sealed feeder is connected to the pyrolysis furnace. The pyrolysis furnace is equipped with a high-speed feed roller, a feed transition plate, a pyrolysis chain plate, a slag scraper chain plate, a radiant tube, a pyrolysis gas outlet, a third torque switch, a discharge transition plate, a high-speed discharge roller, a residue outlet, and a slag storage hopper. Specifically: the high-speed feed roller is located at the left end of the pyrolysis furnace, adjacent to but not in contact with the second guide plate of the sealed feeder; a feed transition plate is located adjacent to but not in contact with the high-speed feed roller on its right side; the pyrolysis chain plate is located adjacent to but not in contact with the feed transition plate on its right end; the pyrolysis chain plate is located in the middle of the pyrolysis furnace, with a non-contacting section below it. The slag scraper chain plate is close to the furnace bottom but does not contact it. The right end of the slag scraper chain plate is the residue outlet, and the residue outlet is connected to the slag storage hopper below it. The left and right ends of the pyrolysis chain plate are provided with rotatable sprockets and chain plates that rotate around the sprockets. Several horizontally parallel radial tubes are provided in the gaps and above the chain plates. The right end of the pyrolysis chain plate is also provided with an adjacent but non-contact discharge transition plate. The upper middle position of the upper surface of the discharge transition plate is provided with the third torque switch. The right end of the discharge transition plate is provided with an adjacent but non-contact high-speed discharge roller. The upper right side of the pyrolysis furnace is also provided with the pyrolysis gas outlet.

[0020] In a preferred embodiment, the right end of the pyrolysis furnace is connected to the sealed conveyor. The sealed conveyor includes a left connecting flange, a third isolation gate, a third guide plate, a third support plate, a third torque switch wiring, a third controller, a third photoelectric switch, a conveyor chain, a nitrogen purging port, a third drive motor, a fourth drive motor, a fourth controller, a fourth torque switch, a fourth isolation gate, a fourth photoelectric switch, a fourth guide plate, reinforcing ribs, a fourth support plate, a right connecting flange, and an insulation layer. The structural features and connection method of the sealed conveyor are basically the same as those of the sealed feeder, the main difference being that the sealed conveyor also has an insulation layer on its outer side.

[0021] In a preferred embodiment, the right end of the sealed conveyor is connected to the low-temperature oxidation furnace. The low-temperature oxidation furnace includes a purge port, a high-speed feed roller, a left connecting plate, an oxidation chain plate, an air distribution box, a heating pipe, a feed inlet, a flue gas outlet, a right connecting plate, a high-speed discharge roller, a slag outlet, and a slag storage bin. The low-temperature oxidation furnace has a box-like structure, with the purge port located on its lower left side. The high-speed feed roller is adjacent to but not in contact with the right transition plate of the sealed conveyor. The left connecting plate is adjacent to but not in contact with the high-speed feed roller on its right side. The oxidation chain plate is adjacent to but not in contact with the left connecting plate on its right side. The oxidation chain plate is positioned in the middle of the low-temperature oxidation furnace. Both ends of the oxidation chain plate have rotatable sprockets and chain plates that rotate around the sprockets. The air distribution box is located in the gap between the chain plates. The right end of the oxidation chain plate is provided with a right connecting plate that is adjacent to but not in contact with it. The right connecting plate has a notch in the middle and is provided with a high-speed discharge roller that is adjacent to but not in contact with it. Above the oxidation chain plate, there are several horizontally parallel heating tubes. The upper left of the low-temperature oxidation furnace is provided with a feed inlet. The lower part of the feed inlet is directly opposite the left end of the low-temperature oxidation chain plate. The upper right of the low-temperature oxidation furnace is provided with a flue gas outlet. The lower right of the low-temperature oxidation furnace is provided with a slag outlet. Below the slag outlet is a slag storage bin.

[0022] In a preferred embodiment, the right end of the low-temperature oxidation furnace is connected to the cooling discharge machine, which includes a brush roller, a cooling air inlet, a gas outlet, a cooling chain plate, a buffer channel, and a discharge valve. The brush roller is located at the left end of the cooling discharge machine, directly above and to the right of the right connecting plate of the low-temperature oxidation furnace. The cooling chain plate is located slightly to the right below the brush roller. The cooling air inlet is located adjacent to the right side of the brush roller, directly below the cooling chain plate. The gas outlet is located slightly above and to the right of the right end of the cooling chain plate, below which is the buffer channel. The discharge valve is located below the buffer channel.

[0023] Preferably, the system further includes an incinerator, which comprises a combustion air inlet, an auxiliary fuel inlet, a pyrolysis gas inlet, a flue gas inlet, and a flue gas outlet. The combustion air inlet is connected to the gas outlet. The cooling discharge machine uses air to cool the material and introduces the heated air into the incinerator as combustion air. The pyrolysis gas inlet is connected to the pyrolysis gas outlet of the pyrolysis furnace, directly using the pyrolysis gas generated by the thermal decomposition of the blades as fuel for system heating. The flue gas inlet is connected to the flue gas outlet of the low-temperature oxidation furnace, further incinerating the low-temperature flue gas generated by the low-temperature oxidation furnace to remove unburned organic matter. The flue gas outlet is divided into two branches, called the main path and the main branch. The main branch is connected to the radiant tube of the pyrolysis furnace and supplies energy to the energy-consuming equipment. The outlet of the radiant tube also has two branches, called the auxiliary path and the auxiliary branch. The auxiliary branch is connected to the heating tube of the low-temperature oxidation furnace and flows into the energy-consuming equipment.

[0024] Preferably, in the aforementioned decommissioned wind turbine blade heat conversion and recovery system, the main branch and the auxiliary branch are equipped with flow control valve one and flow control valve two, which are used to adjust the gas flow in the branch to adjust the temperature of the pyrolysis furnace and the low-temperature oxidation furnace.

[0025] Preferably, in the aforementioned decommissioned wind turbine blade heat conversion and recovery system, the distance between the first torque switch to the fourth torque switch and the chain plate below them is 5~20 mm.

[0026] Preferably, in the aforementioned heat conversion and recovery system for decommissioned wind turbine blades, "adjacent but not in contact" means that the distance between the two is 1~10 mm.

[0027] Preferably, in the aforementioned heat conversion and recovery system for decommissioned wind turbine blades, the rotation speed of the high-speed feed / discharge rollers in the pyrolysis furnace and the low-temperature oxidation furnace is 10-500 r / min.

[0028] The beneficial effects of this invention are as follows:

[0029] 1. It overcomes the shortcomings of conventional wind turbine blade heat conversion equipment, which requires material crushing and cannot handle large-sized raw materials. It avoids the wind turbine blade crushing process, protects the fiber structure, and results in high-quality recycled fibers.

[0030] 2. A special feeding and discharging device was designed. By opening and closing the isolation door, the gas is replaced, and the mutual transfer and mixing between the outside air, the atmosphere of the pyrolysis furnace and the low-temperature oxidation furnace is blocked. This realizes temperature-controlled anaerobic pyrolysis of the fan blades and low-temperature oxidation of the pyrolysis residue, achieving efficient recovery of blade fibers and efficient thermal conversion of organic matter.

[0031] 3. By designing structural components such as transition plates and high-speed rollers in the sealed feeder, sealed conveyor, pyrolysis furnace and low-temperature oxidation furnace, stable conveying of large-sized materials, small-sized materials, and tiny materials such as slag is achieved, which greatly improves the range of materials that can be handled in the system and enhances the applicability of the device.

[0032] 4. By designing an incinerator to burn pyrolysis gas and low-temperature oxidation flue gas, efficient recovery of organic matter energy from the fan blades and self-heating operation of the system are achieved.

[0033] 5. By designing a multi-stage heating system for the incinerator flue gas and recycling the cooling air back to the pyrolysis furnace, the energy was utilized in stages, significantly improving energy efficiency and saving system energy consumption. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of a heat conversion and recovery system for wind turbine blades.

[0035] Figure 2 This is a schematic diagram of the sealed feeder.

[0036] Figure 3 This is a schematic diagram of the transition conveyor.

[0037] [Explanation of Key Component Symbols]

[0038] 1-Feeder; 2-Isolation Conveyor; 3-Sealed Feeder; 4-Pyrolysis Furnace; 5-Sealed Conveyor; 6-Incinerator; 7-Low Temperature Oxidation Furnace; 8-Cooling Discharge Machine; 21-Conveyor Chain Plate; 22-Isolation Curtain Door; 23-Isolation Chamber; 24-First Torque Switch; 25-Flange Connection Port; 31-Left Flange Interface; 32-First Isolation Gate; 33-First Guide Plate; 34-First Support Plate; 35-First Torque Switch Wiring; 36-First Controller; 37-First Photoelectric Switch; 38-Feeding Chain Plate; 39-Nitrogen Purge Port; 310-First Drive Motor; 311-Second drive motor; 312-Second controller; 313-Second torque switch; 314-Second isolation gate; 315-Second photoelectric switch; 316-Second guide plate; 317-Reinforcing rib plate; 318-Second support plate; 319-Right flange interface; 41-High-speed feed roller; 42-Feed transition plate; 43-Pyrolysis chain plate; 44-Slag scraper chain plate; 45-Radiation tube; 46-Pyrolysis gas outlet; 47-Third torque switch; 48-Discharge transition plate; 49-High-speed discharge roller; 410-Residue outlet; 411-Slag storage hopper; 51-Left connecting flange; 5 2-Third isolation gate; 53-Third guide plate; 54-Third support plate; 55-Third torque switch wiring; 56-Third controller; 57-Third photoelectric switch; 58-Conveyor chain plate; 59-Nitrogen purging port; 510-Third drive motor; 511-Fourth drive motor; 512-Fourth controller; 513-Fourth torque switch; 514-Fourth isolation gate; 515-Fourth photoelectric switch; 516-Fourth guide plate; 517-Reinforcing rib plate; 518-Fourth support plate; 519-Right connecting flange; 520-Insulation layer; 61-Combustion air inlet; 62-Auxiliary fuel inlet; 63-Pyrolysis gas inlet; 64-Flue gas inlet; 65-Flue gas outlet; 66-Flow control valve one; 71-Purge port; 72-High-speed feed roller; 73-Left connecting plate; 74-Oxidation chain plate; 75-Air distribution box; 76-Flow control valve two; 77-Heating tube; 78-Feed inlet; 79-Flue gas outlet; 710-Right connecting plate; 711-High-speed discharge roller; 712-Slag outlet; 713-Slag storage bin; 81-Brush roller; 82-Cooling air inlet; 83-Gas outlet; 84-Cooling chain plate; 85-Buffer channel; 86-Discharge valve. Detailed Implementation

[0039] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0040] This invention addresses existing problems by providing a heat conversion and recovery system for decommissioned wind turbine blades. The device features an ingenious structural design, simple operation and maintenance, and a high degree of automation. It can achieve efficient recovery of glass fibers and carbon fibers from wind turbine blades, as well as efficient energy conversion and utilization of organic matter.

[0041] To achieve the above technical solution, such as Figure 1 As shown, an embodiment of the present invention provides a heat conversion and recovery system for decommissioned wind turbine blades, including a feeder 1, an isolation conveyor 2, a sealed feeder 3, a pyrolysis furnace 4, a sealed conveyor 5, an incinerator 6, a low-temperature oxidation furnace 7, and a cooling discharger 8, wherein:

[0042] The material grabber 1 is located at the left end of the isolation conveyor 2 and is used to grab retired wind turbine blades cut to 2.0 m × 1.5 m × 0.1 m and place them on the conveyor chain plate of the isolation conveyor 2.

[0043] The isolation conveyor 2 includes a conveyor chain plate 21, an isolation curtain 22, an isolation chamber 23, a first torque switch 24, and a flange connection port 25. The left part of the conveyor chain plate 21 is arranged outside the isolation chamber 23, and the right part is arranged inside the isolation chamber 23. The isolation curtain 22 is provided at the left end of the isolation chamber 23, and the flange connection port 25 is provided at the right end of the isolation chamber 23. The first torque switch 24 is located above the right end of the conveyor chain plate 21, and the vertical distance between the two is set to 5 mm.

[0044] like Figure 2The sealed feeder 3, further shown, includes a left flange connection 31, a first isolation gate 32, a first guide plate 33, a first support plate 34, a first torque switch wiring 35, a first controller 36, a first photoelectric switch 37, a feeding chain plate 38, a nitrogen purging port 39, a first drive motor 310, a second drive motor 311, a second controller 312, a second torque switch 313, a second isolation gate 314, a second photoelectric switch 315, a second guide plate 316, a reinforcing rib plate 317, a second support plate 318, and a right flange connection 319.The left flange interface 31 is located at the left end of the sealed feeder and is connected to the flange connection port 25 of the isolation conveyor 2. The first isolation gate 32 is immediately adjacent to the right side of the left flange interface 31. The first isolation gate 32 has a drive structure that allows free control of its opening and closing actions. Below the first isolation gate 32 is the first guide plate 33. The left end of the first guide plate 33 extends to a distance of 2 mm from the right end of the conveyor chain plate 21, and its right end extends to a distance of 2 mm from the left end of the feeding chain plate 38. mm; The first support plate 34 is provided at the center below the first guide plate 33 and connected to it. The receiver of the first photoelectric switch 37 is provided on the right side of the first isolation gate 32 and at the center of the right side of the first guide plate 33, and the transmitter of the first photoelectric switch 37 is directly above it; The first controller 3 is connected to the first isolation gate 32, the first photoelectric switch and the first drive motor 310. The first controller is also provided with the first torque switch wiring 35, which is connected to the first torque switch 24. The opening and closing of the first isolation gate 32 are controlled by the signals of the first torque switch and the first photoelectric switch; The feeding chain plate 38 is located on the right side of the first guide plate 33. The feeding chain plate 38 is located in the lower middle position inside the sealed feeder 3. The left and right ends of the feeding chain plate 38 are provided with sprockets for support and drive and chain plates that rotate around the sprockets. The nitrogen purging port 39 is provided in the gap in the middle of the rotating chain plate of the feeding chain plate 38. The upper right end of the upper chain plate is provided with a second torque switch 313. The right side of the sprocket at the right end of the feeding chain plate 38 is adjacent to the second guide plate 316. The lower center of the second guide plate 316 is provided with a second support plate 318 connected to it. The left and right sides of the second support plate 318 are also provided with reinforcing ribs 317, which are inclinedly connected to the lower center of the left and right parts of the second guide plate 316. The upper middle part of the second guide plate 316 is directly opposite the second isolation gate 314. The left side of the second isolation gate 314 and the top of the sealing feeder are provided with a second photoelectric switch 315. The second controller 312 is connected to the second torque switch, the second photoelectric switch, the second isolation gate 314 and the second drive motor 311 respectively, and controls the opening and closing of the second isolation gate 314 through the signals of the second torque switch and the second photoelectric switch. The right side of the second isolation gate 314 and the right end of the sealing feeder 3 are also provided with a right flange interface 319.

[0045] The right flange interface 319 of the sealed feeder 3 is connected to the pyrolysis furnace 4. The pyrolysis furnace 4 is equipped with a high-speed feed roller 41, a feed transition plate 42, a pyrolysis chain plate 43, a slag scraper chain plate 44, a radiant tube 45, a pyrolysis gas outlet 46, a third torque switch 47, a discharge transition plate 48, a high-speed discharge roller 49, a residue outlet 410, and a slag storage hopper 411. The high-speed feed roller 41 is located at the left end of the pyrolysis furnace 4, 2 mm away from the right guide plate of the sealed feeder 3. The feed transition plate 42 is located adjacent to the high-speed feed roller 41 on its right side. The right end of the feed transition plate 42 is adjacent to but does not contact the pyrolysis chain plate 43. The pyrolysis chain plate 43 is located in the middle of the pyrolysis furnace 4, and the slag scraper chain plate 44 is located below it at a vertical distance of 100 mm. The slag scraper chain plate 44 is 2 mm away from the furnace bottom. mm, the right end of the scraper chain plate 44 is provided with the residue outlet 410, and the residue outlet 410 is connected to the slag storage hopper 411 below; the gap between the chain plates of the pyrolysis chain plate 43 and the upper part of the chain plate are provided with several horizontally parallel radial tubes 45; the right end of the pyrolysis chain plate 43 is also provided with the discharge transition plate 48 at a distance of 2 mm from it, the discharge transition plate 48 is provided with the third torque switch 47 at a vertical distance of 2 mm above the middle of the discharge transition plate 48, and the high-speed discharge roller 49 is provided at a horizontal distance of 2 mm from the right end of the discharge transition plate 48; the upper right of the pyrolysis furnace 4 is also provided with the pyrolysis gas outlet 46.

[0046] The right end of the pyrolysis furnace 4 is connected to the sealed conveyor 5, such as Figure 3 The sealed conveyor 5, as further shown, includes a left connecting flange 51, a third isolation gate 52, a third guide plate 53, a third support plate 54, a third torque switch wiring 55, a third controller 56, a third photoelectric switch 57, a conveyor chain plate 58, a nitrogen purging port 59, a third drive motor 510, a fourth drive motor 511, a fourth controller 512, a fourth torque switch 513, a fourth isolation gate 514, a fourth photoelectric switch 515, a fourth guide plate 516, a reinforcing rib plate 517, a fourth support plate 518, a right connecting flange 519, and an insulation layer 520. The main structural features of the sealed conveyor 5 are basically the same as those of the sealed feeder 3, the difference being that the sealed conveyor 5 also has the insulation layer 520 on the outer side of its main body.

[0047] The right end of the sealed conveyor 5 is connected to the low-temperature oxidation furnace 7, which includes a purge port 71, a high-speed feed roller 72, a left connecting plate 73, an oxidation chain plate 74, an air distribution box 75, a heating tube 77, a feed port 78, a flue gas outlet 79, a right connecting plate 710, a high-speed discharge roller 711, a slag outlet 712, and a slag storage bin 713. The low-temperature oxidation furnace 7 has a box-like structure. A purge port 71 is located on its lower left side. The high-speed feed roller 72 is positioned 2 mm away from the right end of the fourth guide plate 516 of the sealed conveyor 5. A left connecting plate 73, 2 mm away from the right side of the high-speed feed roller 72, is located. An oxidation chain plate 74, 2 mm away from the right side of the left connecting plate 73, is located in the middle of the low-temperature oxidation furnace 7. The oxidation chain plate 74 includes sprockets rotating at both ends and chain plates rotating around the sprockets. An air distribution box 75 is located in the gap between the chain plates. A right connecting plate 710, 2 mm away from the right end of the oxidation chain plate 74, is located at the right end. The right connecting plate 710 has a notch in the middle and is positioned horizontally 2 mm away from the right end. The high-speed discharge roller 711 with a diameter of mm, and several horizontally parallel heating tubes 77 are arranged above the oxidation chain plate 712; the feed inlet 78 is provided on the upper left side of the low-temperature oxidation furnace 7, and the lower part of the feed inlet 78 is directly opposite the left end of the low-temperature oxidation chain plate 74; the flue gas outlet 79 is provided on the upper right side of the low-temperature oxidation furnace 7; the slag outlet 712 is provided on the lower right side of the low-temperature oxidation furnace 7; and the slag storage bin 713 is provided below the slag outlet 712.

[0048] The right end of the low-temperature oxidation furnace 7 is connected to the cooling discharge machine 8. The cooling discharge machine 8 includes a brush roller 81, a cooling air inlet 82, a gas outlet 83, a cooling chain plate 84, a buffer channel 85, and a discharge valve 86. The brush roller 81 is located at the left end of the cooling discharge machine 8, directly above the right end of the right connecting plate 714 of the low-temperature oxidation furnace 7. The lower right side of the brush roller 81 is directly opposite the left end of the cooling chain plate 84. The cooling air inlet 82 is located 100 mm away from the right side of the brush roller 81. The lower side of the cooling air inlet 82 is directly opposite the cooling chain plate 84. The gas outlet 83 is located slightly above and to the right of the right end of the cooling chain plate 84, and the buffer channel 85 is located below it. The discharge valve 86 is located below the buffer channel 85.

[0049] like Figure 1A further example is a heat conversion and recovery system for decommissioned wind turbine blades, which also includes the incinerator 6, comprising a combustion air inlet 61, an auxiliary fuel inlet 62, a pyrolysis gas inlet 63, a flue gas inlet 64, and a flue gas outlet 65. The combustion air inlet 61 is connected to the gas outlet 83. The cooling discharge machine 8 uses air to cool the material and introduces the heated air into the incinerator 6 as combustion air. The pyrolysis gas inlet 63 is connected to the pyrolysis gas outlet 46 of the pyrolysis furnace 4, directly using the pyrolysis gas generated by the thermal decomposition of the blades as fuel for system heating. The flue gas inlet 64 is connected to the flue gas outlet 79 of the low-temperature oxidizer, further incinerating the low-temperature flue gas generated by the low-temperature oxidizer 7 to remove unburned organic matter. The flue gas outlet 65 is divided into two branches, called the main path and the main branch. The main branch is connected to the radiant tube 45 of the pyrolysis furnace 4, and the main path sends the gas to the energy-consuming equipment. The outlet of the radiant tube 45 also has two branches, called the auxiliary path and the auxiliary branch. The auxiliary branch is connected to the heating tube 77 of the low-temperature oxidizer 7, and the auxiliary path flows into the energy-consuming equipment.

[0050] In the description of this invention, the terms "center," "upper," "lower," "left," "right," and "inner," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limitations on the invention. Unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0051] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered to fall within the protection scope of the present invention.

Claims

1. A decommissioned wind turbine blade thermal conversion recycling system, characterized by, The application relates to a device for processing retired wind turbine blades, comprising: a grabbing machine (1), an isolation conveyor (2), a sealed feeding machine (3), a pyrolysis furnace (4), a sealed conveyor (5), an incinerator (6), a low-temperature oxidation furnace (7) and a cooling discharge machine (8), wherein: the grabbing machine (1) grabs the cut retired wind turbine blades and places them on the conveying chain plates (21) of the isolation conveyor (2); the isolation conveyor (2) comprises the conveying chain plates (21), an isolation chamber (23) and isolation curtain doors (22) and a first torsion switch (24) arranged at the two ends of the isolation chamber (23) respectively, the conveying chain plates (21) extend through the isolation curtain doors (22) to the outside of the isolation chamber (23) to receive and convey the cut retired wind turbine blades to the isolation chamber (23), and the first torsion switch (24) is switched between the open and closed states; the sealed feeding machine (3) is sealingly connected to one end of the isolation conveyor (2) provided with the first torsion switch (24) and comprises upper feeding chain plates (38) and first and second isolation gates (32) and (314) arranged at the two ends of the upper feeding chain plates (38) and capable of being switched between the open and closed states, the upper feeding chain plates (38) are arranged to be capable of receiving the cut retired wind turbine blades conveyed by the conveying chain plates (21) in the open state of the first isolation gate (32) and outputting the retired wind turbine blades in the open state of the second isolation gate (314); the pyrolysis furnace (4) comprises a pyrolysis furnace body sealingly connected to one end of the sealed feeding machine (3) provided with the second isolation gate (314), pyrolysis chain plates (43) arranged in the pyrolysis furnace body and slag scraping chain plates (44) arranged below the pyrolysis chain plates (43), and radiation pipes (45) for heating the internal space of the pyrolysis furnace body, the pyrolysis chain plates (43) are arranged to be capable of receiving and conveying the cut retired wind turbine blades output by the sealed feeding machine (3) so that the retired wind turbine blades are pyrolyzed under the radiation of the radiation pipes (45), the pyrolysis furnace body is provided with a pyrolysis gas outlet (46) and a residue outlet (410) for discharging pyrolysis gas and residues generated by the pyrolysis of the cut retired wind turbine blades respectively, and the slag scraping chain plates (44) scrape and discharge the residues through the residue outlet (410); the sealed conveyor (5) is sealingly connected to the other end of the pyrolysis furnace body and conveys the retired wind turbine blade pyrolysis products output by the pyrolysis furnace (4) to the low-temperature oxidation furnace (7). The incinerator (6) comprises a combustion air inlet (61), an auxiliary fuel inlet (62), a pyrolysis gas inlet (63), a flue gas inlet (64) and a flue gas outlet (65), the flue gas outlet (65) is divided into two branches, called main road and main branch, wherein the main branch is connected with the radiant tube (45) of the pyrolysis furnace (4), and the main road is sent into the energy-using equipment; the gas outlet of the radiant tube (45) is also provided with two branches, called auxiliary road and auxiliary branch, the auxiliary branch is connected with the heating pipe (77) of the low-temperature oxidation furnace (7), and the auxiliary road is connected into the energy-using equipment, the main branch and the auxiliary branch are provided with flow control valve one (66) and flow control valve two (76) for adjusting the gas flow of the branch to adjust the temperature of the pyrolysis furnace (4) and the low-temperature oxidation furnace (7); The low-temperature oxidation furnace (7) comprises an oxidation furnace body connected to the far end of the sealing conveyor (5) away from the pyrolysis furnace (4), an oxidation chain plate (74) arranged in the oxidation furnace body, and a plurality of heating pipes (77) arranged above the oxidation chain plate (74), the oxidation chain plate (74) is arranged to receive and transport the cut-off retired fan blade pyrolysis products transported by the sealing conveyor (5), and the space surrounded by the oxidation chain plate (74) is arranged with an air distribution box (75), the oxidation furnace body is provided with a feed inlet (78) facing the feed end of the oxidation chain plate (74), a flue gas outlet (79) for discharging flue gas, and a residue discharge port (712) for discharging residue; The cooling discharging machine (8) comprises a discharging machine box connected to the far end of the oxidation furnace body away from the sealing conveyor (5), a cooling chain plate (84) arranged in the discharging machine box, and a brush roller (81) arranged at the feed end of the cooling chain plate (84), the discharging machine box is provided with a cooling air inlet (82), a gas outlet (83) and a buffer channel (85), and a discharge valve (86) is arranged below the buffer channel (85).

2. A decommissioned wind turbine blade thermal conversion recycling system according to claim 1, wherein, The far end of the isolation chamber (23) away from the grabbing machine (1) is provided with a flange connection port (25), the two ends of the sealing feeder (3) are respectively provided with a left flange interface (31) and a right flange interface (319), the left flange interface (31) is sealingly connected to the flange connection port (25), and one end of the pyrolysis furnace body is sealingly connected to the right flange interface (319).

3. A decommissioned wind turbine blade thermal conversion recycling system according to claim 2, wherein, The sealing feeder (3) comprises a first guide plate (33), a first support plate (34), a first torsion switch wiring (35), a first controller (36), a first photoelectric switch (37), a nitrogen purge port (39), a first drive motor (310), a second drive motor (311), a second controller (312), a second torsion switch (313), a second photoelectric switch (315), a second guide plate (316), and a second support plate (318) right flange interface (319). The first guide plate (33) is supported by the first support plate (34) and located below the first isolation gate (32), and the first isolation gate (32) is opposite to the upper center of the first guide plate (33). The left end of the first guide plate (33) extends to the right end of the adjacent but not contacting conveying chain plate (21), and the right end extends to the left end of the adjacent but not contacting feeding chain plate (38). The first photoelectric switch (37) comprises a group of transmitters and receivers arranged at the right position of the first guide plate (33). The first controller (36) is connected with the first isolation gate (32), the first photoelectric switch (37) and the first drive motor (310). The first controller (36) is connected to the first torsion switch (24) through the first torsion switch wiring (35), and the opening and closing of the first isolation gate (32) are controlled by the detection signals of the first torsion switch (24) and the first photoelectric switch (37). The feeding chain plate (38) is arranged at the lower position inside the sealing feeder (3), and the middle gap position of the feeding chain plate (38) is provided with the nitrogen purge port (39). The second torsion switch (313) is arranged above the right of the feeding chain plate (38). The right end of the feeding chain plate (38) is provided with the second guide plate (316) adjacent to it but not in contact with it, which is supported by the second support plate (318). The upper surface center of the second guide plate (316) is opposite to the second isolation gate (314). The left side of the second isolation gate (314) is provided with the second photoelectric switch (315), which also comprises a group of transmitters and receivers. The second controller (312) is connected with the second torsion switch (313), the second photoelectric switch (315), the second isolation gate (314) and the second drive motor (311) respectively, and the opening and closing of the second isolation gate (314) are controlled by the signals of the second torsion switch (313) and the second photoelectric switch (315).

4. A decommissioned wind turbine blade thermal conversion recycling system according to claim 1, wherein, The pyrolysis furnace (4) comprises a high-speed feeding roller (41) and a feeding transition plate (42) arranged between the feeding chain plate (38) and the pyrolysis chain plate (43) in sequence, and an outfeed transition plate (48) and a high-speed outfeed roller (49) arranged at the outfeed end of the pyrolysis chain plate (43) in sequence.

5. A decommissioned wind turbine blade thermal conversion recycling system according to claim 1, wherein, The sealed conveyor (5) comprises a conveying chain plate (58) and third and fourth isolation gates (52, 514) respectively arranged at both ends of the conveying chain plate (58) and capable of switching between open and closed states, the conveying chain plate (58) is arranged to receive the decommissioned fan blade pyrolysis products output by the pyrolysis furnace (4) in the open state of the third isolation gate (52) and convey the decommissioned fan blade pyrolysis products to the low-temperature oxidation furnace (7) in the open state of the fourth isolation gate (514).

6. A decommissioned wind turbine blade thermal conversion recycling system according to claim 5, wherein, One end of the pyrolysis furnace (4) facing the sealed conveyor (5) is provided with a third torsion switch (47) capable of switching between open and closed states, the sealed conveyor (5) comprises a third guide plate (53), a third support plate (54), a third torsion switch wiring (55), a third controller (56), a third photoelectric switch (57), a third drive motor (510), a fourth drive motor (511), a fourth controller (512), a fourth torsion switch (513), a fourth photoelectric switch (515), a fourth guide plate (516), a fourth support plate (518) and a thermal insulation layer (520), the third guide plate (53) is supported by the third support plate (54) below the third isolation gate (52) and makes the third isolation gate (52) directly opposite the upper center of the third guide plate (53); the third controller (56) is connected with the third isolation gate (52), the third photoelectric switch (57) and the third drive motor (510), the third controller (56) is signal connected to the third torsion switch (47) through the third torsion switch wiring (55), and the opening and closing of the third isolation gate (52) is controlled by the detection signals of the third torsion switch (47) and the third photoelectric switch (57); the fourth guide plate (516) is supported by the fourth support plate (518) below the fourth isolation gate (514) and makes the fourth isolation gate (514) directly opposite the upper center of the fourth guide plate (516); the fourth controller (512) is connected with the fourth isolation gate (514), the fourth photoelectric switch (515) and the fourth drive motor (511), the fourth controller (512) is signal connected to the fourth torsion switch (513), and the opening and closing of the fourth isolation gate (514) is controlled by the detection signals of the fourth torsion switch (513) and the fourth photoelectric switch (515), the thermal insulation layer (520) is arranged outside the main body of the sealed conveyor (5).

7. A decommissioned wind turbine blade thermal conversion recycling system according to claim 1, wherein, The low-temperature oxidation furnace (7) further comprises a purging port (71), a high-speed feeding roller (72), a left link plate (73), a right link plate (710), and a high-speed discharging roller (711). The purging port (71) is arranged below one side of the oxidation furnace body. The high-speed feeding roller (72) and the left link plate (73) are sequentially arranged at the feeding end of the oxidation chain plate (74). The right link plate (710) and the high-speed discharging roller (711) are sequentially arranged at the discharging end of the oxidation chain plate (74). A residue storage bin (713) is arranged below the residue discharging port (712).

8. A decommissioned wind turbine blade thermal conversion recycling system according to claim 1, wherein, The combustion-supporting air inlet (61) is connected with the gas outlet (83). The cooling discharging machine (8) cools the material by using air, and the air after being heated is introduced into the incinerator (6) as combustion-supporting air. The pyrolysis gas inlet (63) is connected with the pyrolysis gas outlet (46) of the pyrolysis furnace (4), and the pyrolysis gas generated by the blade pyrolysis is directly used as fuel for heating of the system. The flue gas inlet (64) is connected with the flue gas outlet (79) of the low-temperature oxidation furnace (7), and the low-temperature flue gas generated by the low-temperature oxidation furnace (7) is further incinerated to remove unburned organic matter.

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